Heat exchanger



April 17, 1945. p |VAR v 2373,900

HEAT EXCHANGER Filed Nov. 25, 1941 2 Sheets-Sheet l INVENTOR filzelz712/ 17 BY WM fiAU- MAM ATTORNEYS.

April 17, 1945. A. P. LIVAR 2,373,900

HEAT EXCHANGER Filed Nov. 25, 1941 2 Sheets-Sheet 2 INVENTOR 35,; 27 /Z/flZ/e P1214421 NW, 824, 04a & MW

ATTORN EYS'.

Patented Apr. 17, ,1945

7 09. l HEATEXCHAN'GER;

Allen P. arinayah,.ohaissa mmisses Corporation, Detroit, Mich, acorporationof v Delaware 1 Application November. .25, ianfsei 1 Claims.t (01.1126

1 My present invention relates to the construction of warm air furnaces,space heaters or the like having particular regard to the vheatexchanger body thereof. My invention distinguishes from prior spaceheatenand furnace heat exchangers in the utilization of relatively few-part's of very simple construction. -The principal object of myinvention is'to provide a heat exchanger of relatively simpleconstruction occupying as little spaceas #possible and having a highrate of heat transfer.

Anotherobject of my invention is to form a heat exchanger assembly ofrelatively-"simple parts comprising principally flat, plates, easilyformed cylindrical flue connectors. and a plurality of identicaltray-like members; By the use of a plurality of tray-like members I amable tobuild-the heat exchanger body with the use of only one set ofsimple dies and forming fixtures, all other parts of the heat exchangerbody being iorrned of sheets or cylindrical sections easily manufacturedon standard sheet metalworking machines. a f Afurther object of myinvention is-to provide a -type of heat exchanger assembly which-canbefformed in a plurality of difierent' styles from a relatively fewsimple parts. Thus the-"sheet metal machines may be run continuously tostamp out and forma large stock of standard parts which can beinterchangeably assembled to fill' orders for heating equipment ofwidely different capacities and styles; r K These and other objects andadvantages of my present invention will bemore readily ascertainablefroman inspection of the following specification taken 'in' connectionwith the ac companying drawings wherein like numerals refer to likeparts throughout. I In the drawings, I I f 1 Fig. 1 is'a wideelevational vviewof a space heater embodying the present invention;'.Fig.2 isa front'elevationalview of the space heater; Fig. 3 is a view inperspective of the assembled heat exchanger body; I I f v I 7 Fig.3; isa plan view of the heat exchanger bp l, q 1 1 v p A Fig. 5 is averticalsection taken substantially along line 5-5 of Fig. 4-. v I

Intheydrawings there is disclosed in Figswl; and 2 aspace-heater of thegravity circulating; gas fired type, but it should be obvious fromsthefollowing 7 description that the. heat exchanger body of the presentinvention may be used in;

.99) othe of, furnaces. As disclosed, the space heatertcomprisesnnenclosing jacket l'llhavmg grillesill atathe 5:10W61: portion thereofthrough whichi air is inducedto travel byflthermosiphonicaction;.-;the-.ainpassing. over the heatexchanger body enclosed inthejacket I0 and intqthespace to be heated through the open top of'thejacket lflpwhichhmay be suitably protected by a screenorjgiglille.:(not;shown). 'Apair of angle bars 12- extend from,1theiront to the rear wall-of the. jacket; and support the heatexchanger body l4 comprising: ,the1 present; invention. Y 1*The;,heatlexchangerfbodypshown in Figs. 3 ,4 and5,;-comprise's a fireboxsection l5v 'and'=a"ra-- diator isectionJS, said sections being formedas substantially, .rectangular 4 enclosures, of. L:relativelyrygreatwidth. and height ,with. respect to tneirzdepth... The .fireboxlsection'l5 comprises a tray-like.- member: :1 1V having. a flange 18 extend ingperipherally: around its edge and lying in a lplanezz substantiallyparallel .to the bottom oi 'zs-a'ndqa bottom'wall 21-',' the depth ofthe enclosure being substantially twice the depth of a single one of thetraylike' members llor l9.

Tli radiatorjsection is iformed from a single I tray-like member 311;substantially identical to is proyidedjwith 'anaccess opening-to theedgeof whi is rasteiieaa tubular member 4a through WW f f heiiisnir t jbe 41. leadin to er -'1 42flocated-;within the firebox secsuriacel oftubular-member. "40. for'the purpose vof supporting amountin'g plate 44which s -eviqed -w h a secondary. air. open ng 45 ands t rrdi tf w l 33,the meta s '34 and l336'and the bottom walljl of ll l r f n clips; 43may be welded to the' inspection door 46, and which provide means forsupporting the outer end of the inspirator tube 4| and the gas supplytube 41 together with such other instruments as are commonly associatedwith gas burners. The tubular member 40 is preferably of such diameterthat the burner head 42 may be withdrawn and inserted therethrough andthe bottom wall ,2!v of the firebox section 15 is preferably providedwith a supporting member 48 upon which the burner head and inspiratortubeare supported.

The firebox section is joined to the radiator section by means of spacerbars 50 welded or other wise suitably attached to the upper comers ofthe two sections, and a pair of flue connectors'il extending between thelower corners thereof, the bars 50 and connectors 5| being so'aligned asto identical tray-like members l1, l9 and 30 may be formed by adeep-drawing, die-pressing operation, or that the same may be formed byother methods such as by notching and shaping a flat sheet and weldingthe corners of the side walls of the tray-like members.

I claim:

1. ,A warm air furnace heat exchanger comprising a firebox section and aradiator section, said sections being formed as substantiallyrectangular enclosures comprising front and rear Walls of sub-'stantially the same size and side, top, and bottom walls, said sectionsbeing horizontally and laterally aligned with the rear wall of thefirebox hold the two sections in horizontal and lateral alignment withthe rear wall 23 of the firebox 1 section spaced from and parallel tothe front wall 33 of the radiator sectiom-the' two walls thus formingthe side walls ofa yerticallyextending air space between the twosections. The air which passes through the grilles 1! travels up wardaroundall of the outer walls of the assembly and through the spacebetween the two sections of the assembly 1 i I In order to provide foreflicient heat :transfer between the flue gases within the sections andthe air outside the sections, the firebox section is prob erablyprovided with a pair of substantially yerti. cal baffles 52 placed oneat-each side of the access opening, the battles extending. from thefront wall 22 to the rear wall 23 and from the lower wall 21 to pointsspaced from the top wall so as to provide openings between the top ofthe baille and the top wall at each side of the space enclosed by the..bailies. The baflies thus form a fire space within which thefiameandflue gases travel up ward and lateral flue spaces within which the fluegases travel downward into the connectors 51. A smoke outlet .53isoprovidedcentrally ot the upper portion of the rearwall .32 of theradi ator sectlon l6 so that the two streamsuoi' flue ases travelthrough. the radiator section and unite while. passing through the smokeoutlet 53.

In or-derto induce circulation through the sections when a fire is firstlit and the furnace section are still cold, the lower irontcorners ofthe baiiies 52 areprovided, with openings .55 suchas by removing thecorners of the home. some of the cold air in the bottom of the lateralflue sections is thus c e a e. d awn hrou h the open lugs 55 andrecirculated back into the line open: ings by the inspirating' effect ofthe flame, Saba stantially immediately thereafter thefiue gases commencefinding their way through the connectors 5l1and the radiator section 16.some of the flue gases will always 'recirculate through the openings 55,thus causing more uniform heating of the front Wa1l'22 and of the bottomwell beneath the burner 42. The em ienc'y'or the assembly is thusgreatly enhanced and distortion'of the walls of the section ismaterially reduced over what would be the case if the "openings 55 wereomitted.

The device illustrated in Figs; 1 to '5, inclusive, is a gas burningspace heater having the usual appur-tenances thereto, such as a draft'divert'er 56 mounted on the smoke outlet 53. Hcweveryit is to beappreciated that other types-of burners may be mounted upon a suitablyformed mounting plate 44 for attachment to the heat exchanger assemblycomprising the -present invention. 'Itisalso to be; appreciated-that thesubstantially section spaced from the front wall of the radiators'ectionto provide a vertical air space therebetween, a pair ofsubstantially vertical baffles in said firebox section extending fromthe front wall to the rear wall thereof and from the bottom wall topoints spaced from the top wall thereof, said baflles being laterallyspaced from the center and the side walls of said firebox section t forma central fire space and lateral fluespaces, flue connectors extendingrearwardly from the rear wall of said firebox section adjacent the lowerportion of each of saidflue spaces to theiower corner of the front wallof said radiator section, and a smoke Outlet at the upper, centralportion of said radiator section. V

2. A warm air furnace heat exchanger comprising a firebox section and aradiator section, said sections being formed as substantiallyrectangular enclosures comprising front and rear walls of substantially.the same size and 'side, top,: and bottom walls, said sections beinghorizontally and laterally alignedwith the rear-wall of the fireboxsection Spaced from the front wall of the radiator section to provide avertical air space therebetween, a pair of substantially verticalbaffles in said firebox section extending'from the front wall to therear wall thereof and from the bottom wall to points spaced from thetopwall thereof, said baflies being laterally spaced from the center andthe side walls ofsaid firebox section to form a central fire space andlateral flue spaces, flue connectors extending rearwardlyfrom the rearwall of said firebox section adjacent the lower portion of eachof saidflue spaces to the lower corners of the front wallof said radiatorsection, and a smoke outlet at the upper central portion of saidradiator'section-each of said baffles having an opening therethroughadjacent the lower, front corners thereof permitting recirculation ofsome of the flue gas from the flue spaces into the fire space wherebymore evenly to heat the entire front wall of the firebox section I 3. ,AWarm air furnace heat exchanger comprising a firebox section andaradiator section, said sections being formed as substantiallyrectangular enclosures comprising front'and rear walls 'of substantiallythe'same size and side, top, and bottom walls, said sections beinghorizontally and laterally aligned with the rear wall of the fireboxsection spaced from the front wall of the radiator section to provide avertical air space therebetween, a pair of substantially verticalbafiles in said firebox section extending from the front wall to therear Wall thereof and from the bottom wall to points spaced from the topwall thereof, said bafiles being laterally spaced from the center andthe side walls of said firebox section to form a central fire space andlateral flue spaces, flue connectors extending .-rearwardly from therear;

wall of said-firebox section adjacent the lower abortion of each of.said flue spaces. to the lower its lower, front. corners cut away: so asto provide communication between'the lower,,front portions of. said fluespaces and said fire Space permitting recirculation-of ,someof the fluea from the flue spaces into th'e fire space whereby more evenly to.,heatthe. entire front; wall of thefireboxsection.

said sections being formed as substantially. rectangular enclosurecomprising front and rear walls of substantially the same'size and side,top, and bottom walls, said sections being horizontally and laterallyaligned with the rear wall of the firebox section spaced from the frontwall of the radiator section to provide a vertical air spacetherebetween, a pair of substantially vertical baffles in said fireboxsection extending from the front wall to the rear wall thereof and fromthe bottom wall to points spaced from the top wall thereof, said bafllesbeing laterally spaced from the center and the side walls of saidfirebox section to form a central fire space and lateral flue spaces,flue connectors extending rearwardly from the rear wall of said fireboxsection adjacent the lower portion of each of said flue spaces to thelower corners of the front wall of said radiator 1, section, and a smokeoutlet at the upper, central portion of said radiator section, saidfirebox section comprising a pair of substantially identical,

tray-like members each including an upstanding wall forming one of thefirst mentioned walls and pairs of opposed walls projecting from saidupstanding wall toward the other of said members bottom walls, saidsections being horizontally and laterally aligned with the rear wall'ofthe firebox section spaced from'the front wall of the radiator sectionto provide a vertical air space therebetween, a pair of substantiallyvertical bafilles in said firebox section extending from the front wallto the rear wall thereof and from the bottom wall to points spaced fromthe top wall thereof, said bailles being laterally spaced from thecenter and the side walls of said firebox section to form a central firespace and lateral flue spaces, flue connectors extending rearwardly fromthe rear wall of said firebox section adjacent the lower portion of eachof said flue spaces to the lowercorners of the front wall of saidradiator section, and a smoke outlet, at the upper, central portionofsaid radiator section, said firebox section comprising a pair ofsubstantially identical, tray-like members each including an upstandingwall forming one of the first mentioned' walls and pairs of opposedwalls projecting from said upstanding wall toward the other of saidmembers respectively forming portions of said side walls and said topand bottom walls, the projecting wall forming portions of one of saidmembers and the corresponding projecting p ,r 1 1 a A ,war r. urn ce.;,iea e han er pom-. prising; ,a firebox section and a-, radiator section,

wall forming. portions ofitheother of said mem bers having their edgesiabutted and joined,to-

,gether'throughout their extent,- and said radiator section comprising athird tray-,likemember substantially identical: etc; the tray likevmembers forming said firebox section. H c

.6: A-xwarmair furna'ce;, heat'exchanger .comprising, afireboxsectionand a radiator section, said sections being formed, assubstantially recansular; closu es; c p sin f ont and r r walls ofsubstantially the sameysize and side, top, and; bottom walls,,saidsections being horizontaly; and. at ra ly a ned w he ear l of t e. re x:eq as aced fr m th -front wan of; th radiator section to provide avertical air space therebetween, a pair of substantially verticalbaflles in said firebox section extending from, the front wall to therear wall thereof and from the bottom wall to points spaced from the topwall thereof, said bafiles being laterally spaced from the center andthe side walls of said firebox section to form a central fire space andlateral flue spaces, flue connectors extending rearwardly from the rearwall of said firebox section adjacent the lower portion of [each of saidflue spaces to the lower corners of the front Wall of said radiatorsection, and a smoke outlet at the upper, central portion of saidradiator section, said firebox section comprising a pair ofsubstantially identical, tray-like members each including an upstandingwall forming one of the first mentioned wallsand pairs of opposed wallsprojecting from said upstanding wall toward the other prising a fireboxsection and a radiator section, said sections being formed assubstantially rectangular enclosures comprising front and rear walls ofsubstantially the same size and side, top, and bottomwalls, saidsections being horizontally and laterally aligned with the rear wall ofthe firebox section spaced from the front wall of the radiator sectionto provide a vertical air space therebetween, a pair of substantiallyvertical baffles in said firebox section extending from the front wallto the rear wall thereof and from the bottom wall to, points spaced fromthe top wall thereof, said baiiles being laterally spaced from thecenter and the side walls of said firebox section to form a central firespace and lateral flue spaces, fiue connectors extending rearwardly fromthe rear wall of said firebox section adjacent the lower portion of eachof said flue spaces to the lower corners of the front wall of saidradiator section, and a smoke outlet at the upper, central portion ofsaid radiator section, said firebox section comprising a pair ofsubstantially identical, tray-like -members each including an upstandingwall forming one of the first mentioned Walls and pairs of opposed wallsprojecting from said upstanding wall toward the other of said membersrespectively forming portions of said side walls and said top andbottom-walls, the projecting wall forming portions of one of saidmembers and the corresponding projecting wall forming portions of theother of said members having flanges protruding from the edges thereofplaced in faceto-face relationship and Welded to each other 4 I nave-eonthroughout their extent, and said radiator section comprising athird'tmy-likemembersub.- stantiaily identical to the tray-like membersforming the firebox section and a flat sheet haw ing its peripherywelded to the fiangeof said traylike member throughout its extent, 1 t

8. A warm air furnace heat exchanger: compising a firebox section and aradiator section, said firebox section having one wall thereof adjacentto and spaced from the adjacent wall o! 10 said radiator section toprovide a vertical-air space between said sections, a pair of substan--tially vertically disposed baflles in said firebox section extendingfrom said one well to the wall

